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Police and medical services respond to an emergency on Drottninggatan street following a truck driving into the Ahlens department store in Stockholm, Sweden, on Friday, April 7, 2017. A hijacked truck slammed into a building in downtown Stockholm, killing at least three people and injuring many others in what the Swedish Prime Minister was quick to describe as a terror attack. Photographer: Johan Jeppsson/Bloomberg via Getty Images

Police and medical services respond to an emergency on Drottninggatan street following a truck driving into the Ahlens department store in Stockholm, Sweden, on Friday, April 7, 2017. A hijacked truck slammed into a building in downtown Stockholm, killing at least three people and injuring many others in what the Swedish Prime Minister was quick to describe as a terror attack. Photographer: Johan Jeppsson/Bloomberg via Getty Images